After returning to Japan at his father's behest, tennis sensation Ryouma Echizen joins Seishun Academy with dreams of dominating the national tennis scene. Despite being a freshman, Ryouma impresses the team captain and competes for a spot in the starting lineup during the school's ranking matches. Initially met with skepticism due to his age, Ryouma's talent and unwavering resolve win over his teammates, leading Seishun to aim for victory in the National Tournament. To qualify, they must triumph in the Tokyo Prefectural and Kanto Regionals, facing off against formidable opponents with distinct playing styles and motivations. The team's success hinges on their ability to unite and collaborate, striving to achieve their shared goal of championship glory.